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https://issues.apache.org/jira/browse/HADOOP-9713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17099903#comment-17099903
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Steve Loughran commented on HADOOP-9713:
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s3a does lazy seek already. I'd be reluctant to add that to FsDataInputStream,
as it might create more confusion. But it would let you do back-to-back
readFully...
> FSDataInputStream.readFully doesn't work on filesystems without seek -even
> when the offset==getPos
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9713
> URL: https://issues.apache.org/jira/browse/HADOOP-9713
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.1.0-beta, 1.3.0, 3.0.0-alpha1
> Reporter: Steve Loughran
> Assignee: Mikhail Pryakhin
> Priority: Minor
>
> {{FSDataInputStream.readFully(offset,data)}} doesn't work even if the
> offset==the current location -because it always seeks to the offset and seeks
> back. No seek => Exception.
> We could optimise {{FSDataInputStream.readFully(offset,data)}} to eliminate
> the seeks on these operations -which would have tangible benefits for those
> filesystems where seek is expensive (remote blobstores). It would also let
> you use readFully against filesystems without seeks, provided you are only
> reading from the current location.
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